Motor responses of the femoral nerve: With peripheral nerve stimulation of the femoral nerve, two responses may be elicited, sartorius muscle contraction (contraction of the sartorius muscle through stimulation of its muscular branch) or quadriceps muscle contraction or patella twitch (contraction of the quadriceps muscle through stimulation its respective muscular branches). The two divisions of the femoral nerve are in fact medial and lateral divisions rather than anterior and posterior . The medial division supplies the sartorius muscle and the lateral division supplies the quadriceps muscle and both divisions lay within close proximity in the same fascial plane. Several regional anesthesia texts states that the anterior branch, supplying a motor branch to sartorius is above the fascia iliaca and this is partly why this stimulation should not be sought for FNB because there would be inadequate spread around the femoral nerve. An anatomical study by Gustafson et al and other anatomical text have forfeited this theory , . Furthermore, the rectus femoris of quadriceps often gets part of its innervation from the same division supplying the sartorius muscle.